1. Department of Gastroenterology and Hepatology; Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Science; Okayama Japan
2. Department of Pathology and Oncology; Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences; Okayama Japan
3. Department of Gastroenterological Surgery; Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences; Okayama Japan